diff --git a/Learun.Framework.Ultimate V7/Learun.Application.Organization/User/UserBLL.cs b/Learun.Framework.Ultimate V7/Learun.Application.Organization/User/UserBLL.cs
index 6b899a69a..0e6b8d1bc 100644
--- a/Learun.Framework.Ultimate V7/Learun.Application.Organization/User/UserBLL.cs	
+++ b/Learun.Framework.Ultimate V7/Learun.Application.Organization/User/UserBLL.cs	
@@ -668,7 +668,7 @@ namespace Learun.Application.Organization
                             companyId = item.F_CompanyId,
                             departmentId = item.F_DepartmentId,
                             name = item.F_RealName,
-                            mobile=item?.F_Mobile
+                            mobile=item.F_Mobile ?? ""
                         };
                         string img = "";
                         if (!string.IsNullOrEmpty(item.F_HeadIcon))